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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6950ab4e9cd3db7896a2867048fe56f67ffb63fc702a3fc62c4a06400b238c' 
  AND token = 'ISvq1tYGNdkaaTZqQ5+Ym6IeY/hbtDpr/mcbPkS1oOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}